No matter how confident and self-assured we'd like to think we are, it's not often accurate to say that we're completely invincible to insecurities.
Whether we're talking about the imposter syndrome people tend to experience at new jobs or shame at feeling like we're not at the right place in life, we are going to face moments in our lives when we don't feel like we're "enough."
But while many people can be honest about these feelings and work towards developing healthy, realistic expectations for themselves, others are in much stronger denial about them. So instead, they overcompensate and present themselves as having already succeeded at what they're insecure about.
And while there are many ways to do this, a particularly common one concerns those who don't see themselves in the most toxic stereotypes of masculinity, but see that more as a problem with themselves than with the stereotype.
And based on the responses seen in one Reddit thread, it seems these folks aren't masking their insecurities as cleverly as they thought.